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Yes, you can adjust the picture by using your remote going to settings, or "Adjust" when your t.v. turns on and off by itself could have'ft to do with nasty weather near you, or the cord is loose and it needs to be pushed in all the way.

1st problem-reduce the supply voltage on the power supply to the recommended 95v.if prob does not clear change suspect capacitors around the line output transformer.
2nd problem-check;continuity of av-cables
;dry joints on av inlet sockets of the tv card.

Hi,
Your question "Do bigger TV's need an aerial booster or something?" - No, normally it should work straight out. Boosters are used for fringe location not bigger TV.
Pls a questions and some ideas:
1. "TV worked fine the night before" was it hooked up to Cable or aerial?
2. If cable, it is necessary that you change the settings of the TV from cable to STD or Air or something like that. Normally this can be done via the remote, menu, setting, set-up;
3. If aerial, you would probably need the assistance of a qualified service personnel. Apparently something got loose inside the Philips TV, not a big problem because you can still receive (BBC 1) but not the other channels, possibly a loose wiring, a disconnected connector.
4. If you feel comfortable working on it yourself, unplug the tv and the aerial, open the back and poke around. Trace from the aerial jack, the lead wires used, the connector to the main circuitry. Wiggle the wires a bit for any loose connection.
5. If #4 is not to your liking or if you do not find anything or no significant improvement after closing it up and running it again, guess you're back to #3.
Hope this gives you some idea. Lots of luck and kind regards from the Philippines.